Some other tips - prefer characters with high power. Play more characters from the same clan - for possibility of getting bonus of this clan. Prefer characters from clans, which have bonus for power or attack (Bangers or Ulu Watu for 2 power, Junkz and Sentinels for 8 attack, Montana, Sakrohm and Uppers for reducing opponent attack) - have better chance to win duel.
And level characters as fast as possible, characters are much better where leveled.
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.